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EP-4738567-A1 - POWER STORAGE DEVICE

EP4738567A1EP 4738567 A1EP4738567 A1EP 4738567A1EP-4738567-A1

Abstract

A power storage device (B) includes: a first power storage cell (10, 1(6)); a second power storage cell (10, 2(6)); and a wiring board (200). The wiring board includes a substrate (201, 201A to 201G), and a plurality of conductor members (211 to 216, 221 to 223, 231 to 236) provided on a vertically upper surface (F1) of the substrate. The plurality of conductor members include a first conductor member (211) and a second conductor member (212). The first power storage cell includes, on a vertically lower surface (F10) thereof, a first electrode terminal (11) connected to the first conductor member. The second power storage cell includes, on a vertically lower surface (F10) thereof, a second electrode terminal (12) connected to the second conductor member. At least one of a protrusion (M1, M21, M22), a recess (R10, R10A) and a through hole (h22, h22A, h22B) is provided in a portion of the substrate between the first electrode terminal and the second electrode terminal.

Inventors

  • TSUNEKAWA, KUNIHIRO
  • NAKADA, KOKI
  • TAKESHITA, SHINYA
  • TAKAHASHI, NAOYUKI
  • KIMURA, RYO
  • KATO, KAZUHITO
  • Shimonaka, Toshihiro
  • ICHISAWA, Kota
  • MIYAHARA, KENTA

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260506
Application Date
20250929

Claims (9)

  1. A power storage device (B) comprising: a first power storage cell (10, 1(6)); a second power storage cell (10, 2(6)); and a wiring board (200), wherein the wiring board includes a substrate (201, 201A to 201G), and a plurality of conductor members (211 to 216, 221 to 223, 231 to 236) provided on a vertically upper surface (F1) of the substrate, the plurality of conductor members include a first conductor member (211) and a second conductor member (212), the first power storage cell includes, on a vertically lower surface (F10) thereof, a first electrode terminal (11) connected to the first conductor member, the second power storage cell includes, on a vertically lower surface (F10) thereof, a second electrode terminal (12) connected to the second conductor member, and at least one of a protrusion (M1, M21, M22), a recess (R10, R10A) and a through hole (h22, h22A, h22B) is provided in a portion of the substrate between the first electrode terminal and the second electrode terminal.
  2. The power storage device according to claim 1, wherein one or more through holes (h22, h22A, h22B) are formed in the portion of the substrate (201, 201A to 201F) between the first electrode terminal and the second electrode terminal.
  3. The power storage device according to claim 2, wherein the substrate (201, 201A to 201C, 201F) includes one or more first portions (201a) located at edge portions of the one or more through holes (h22), and a second portion higher in degree of hydrophobicity than the first portions.
  4. The power storage device according to claim 2, wherein the substrate (201, 201C) includes a first inclined portion (F11) inclined downward from the first electrode terminal toward the one or more through holes (h22), and a second inclined portion (F 12) inclined downward from the second electrode terminal toward the one or more through holes (h22).
  5. The power storage device according to claim 2, wherein a recess (R10, R10A) is formed in the portion of the substrate between the first electrode terminal and the second electrode terminal, and the one or more through holes (h22) are formed in the recess.
  6. The power storage device according to any one of claims 2 to 5, wherein the power storage device includes a gas discharge path (P1) through which a gas discharged from each of the first power storage cell and the second power storage cell flows, and the one or more through holes (h22) communicate with the gas discharge path.
  7. The power storage device according to claim 6, wherein a water absorbing member (60) is provided between the one or more through holes (h22) and the gas discharge path (P1).
  8. The power storage device according to claim 6, wherein each of the first power storage cell and the second power storage cell further includes an explosion-proof valve (13) on the vertically lower surface (F10) thereof, the substrate (201F) is located on a vertically lower side of the explosion-proof valve of each of the first power storage cell and the second power storage cell, the gas discharge path (P1) is located on a vertically lower side of the substrate, and a cooler (50) is provided on a vertically lower surface (F2) of the substrate.
  9. The power storage device according to claim 1, wherein one or more protrusions (M1, M21, M22) are formed in the portion of the substrate (201B, 201G) between the first electrode terminal and the second electrode terminal.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This nonprovisional application is based on Japanese Patent Application No. 2024-190805 filed on October 30, 2024 with the Japan Patent Office, the entire contents of which are hereby incorporated by reference. BACKGROUND Field The present disclosure relates to a power storage device including a plurality of power storage cells. Description of the Background Art Chinese Patent Laying-Open No. 116686151 discloses a power storage device including a plurality of power storage cells fixed in a case (accommodation cavity). An electrode terminal of each of the power storage cells is provided to face a bottom wall of the case. SUMMARY In the power storage device described in Chinese Patent Laying-Open No. 116686151, water generated in the case due to condensation or the like may cause a short circuit between the electrode terminals of the power storage cells adjacent to each other. The present disclosure has been made to solve the above-described problem and an object thereof is to provide a power storage device in which a short circuit between electrode terminals of power storage cells adjacent to each other is less likely to occur. According to the present disclosure, a power storage device described below is provided. (Clause 1) The power storage device includes: a first power storage cell; a second power storage cell; and a wiring board. The wiring board includes a substrate, and a plurality of conductor members provided on a vertically upper surface of the substrate. The plurality of conductor members include a first conductor member and a second conductor member. The first power storage cell includes, on a vertically lower surface thereof, a first electrode terminal connected to the first conductor member. The second power storage cell includes, on a vertically lower surface thereof, a second electrode terminal connected to the second conductor member. At least one of a protrusion, a recess and a through hole is provided in a portion of the substrate between the first electrode terminal and the second electrode terminal. According to the above-described configuration, even when water is generated in one power storage cell of the power storage cells (the first power storage cell and the second power storage cell) adjacent to each other, spreading of the water to the other power storage cell is suppressed. This makes it less likely to cause a short circuit between the electrode terminals of the power storage cells adjacent to each other. (Clause 2) In the power storage device according to Clause 1, one or more through holes are formed in the portion of the substrate between the first electrode terminal and the second electrode terminal. The presence of the one or more through holes between the electrodes of the power storage cells adjacent to each other makes it less likely to cause a short circuit between the electrode terminals due to water. (Clause 3) In the power storage device according to Clause 2, the substrate includes one or more first portions located at edge portions of the one or more through holes, and a second portion higher in degree of hydrophobicity than the first portions. Since the first portions are located at the edge portions of the through holes, water between the electrodes is more easily guided to the through holes. (Clause 4) In the power storage device according to Clause 2 or 3, the substrate includes a first inclined portion inclined downward from the first electrode terminal toward the one or more through holes, and a second inclined portion inclined downward from the second electrode terminal toward the one or more through holes. By the first inclined portion and the second inclined portion, water between the electrodes is more easily guided to the through holes. (Clause 5) In the power storage device according to any one of Clauses 2 to 4, a recess is formed in the portion of the substrate between the first electrode terminal and the second electrode terminal, and the one or more through holes are formed in the recess. According to the above-described configuration, the presence of the recess and the through holes between the electrodes of the power storage cells adjacent to each other makes it less likely to cause a short circuit between the electrode terminals due to water. (Clause 6) In the power storage device according to any one of Clauses 2 to 5, the power storage device includes a gas discharge path through which a gas discharged from each of the first power storage cell and the second power storage cell flows. The one or more through holes communicate with the gas discharge path. According to the above-described configuration, water falling into the through holes is more easily discharged together with the gas. (Clause 7) In the power storage device according to Clause 6, a water absorbing member is provided between the one or more through holes and the gas discharge path. By the water absorbing member, an amount of water (liquid)